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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Parallax vs Focus
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<blockquote data-quote="Bart B" data-source="post: 101616" data-attributes="member: 5302"><p>[ QUOTE ]</p><p>So, please tell me why did the 2x20 Leupold and my 1.5-6 Sig. become clear when I turn out on the eyepiece. This is getting confusing.</p><p></p><p>[/ QUOTE ]</p><p>If the target image became sharp and clear when you backed out the eyepiece, that happened because the objective lens was focusing the target image well behind the reticule. The eyepiece lens has to be a fixed distance behind the target image formed by the objective lens. That distance is determined by your eye and glasses if you wear them.</p><p></p><p>If the target was at a very close range its image may well have been focused quite a ways behind the reticule. That's why you had to unscrew the eyepiece quite a bit to get it focused sharply on the target image.</p><p></p><p>Here's another way to look at it. Imagine a slide projector focusing a picture on a screen. This is what the objective (front) lens on a rifle scope does. Now take a magic marker and draw a large + on the screen; that + represents the scope's reticule. Take a pair of binoculars and look at the projection screen through them while sitting by the projector; you'll have to focus the binoculars to see the image as well as the retiule; this is what the eyepiece does. Now if you focus the projector so it makes a sharp image in front of or behind the projection screen, the image on the screen won't be sharp any longer. In order to see the image at its new position sharp and clear, you have to change the focus on the binoculars. So you refocus the binoculars and the image is sharp again but the + is no longer sharp 'cause it's not where the image is focused.</p><p></p><p>Hope this helps.......</p></blockquote><p></p>
[QUOTE="Bart B, post: 101616, member: 5302"] [ QUOTE ] So, please tell me why did the 2x20 Leupold and my 1.5-6 Sig. become clear when I turn out on the eyepiece. This is getting confusing. [/ QUOTE ] If the target image became sharp and clear when you backed out the eyepiece, that happened because the objective lens was focusing the target image well behind the reticule. The eyepiece lens has to be a fixed distance behind the target image formed by the objective lens. That distance is determined by your eye and glasses if you wear them. If the target was at a very close range its image may well have been focused quite a ways behind the reticule. That's why you had to unscrew the eyepiece quite a bit to get it focused sharply on the target image. Here's another way to look at it. Imagine a slide projector focusing a picture on a screen. This is what the objective (front) lens on a rifle scope does. Now take a magic marker and draw a large + on the screen; that + represents the scope's reticule. Take a pair of binoculars and look at the projection screen through them while sitting by the projector; you'll have to focus the binoculars to see the image as well as the retiule; this is what the eyepiece does. Now if you focus the projector so it makes a sharp image in front of or behind the projection screen, the image on the screen won't be sharp any longer. In order to see the image at its new position sharp and clear, you have to change the focus on the binoculars. So you refocus the binoculars and the image is sharp again but the + is no longer sharp 'cause it's not where the image is focused. Hope this helps....... [/QUOTE]
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Parallax vs Focus
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